I had a feeling, that would most likely void the factory warranty. I sent the shop (linked earlier in this thread) an email to confirm and see what the story is.
No idea where you are in the state, but in western ny here is a company that is into ARs
ddsranch.com
Full disclaimer they are not a sponsor here but on this end of the state they are one of the only places I know of into ARs
If you are in eastern side of the state you can't go wrong with @bulletguy